/* Micro-C Code Generatation Part for intel386 */
#define EXTERN extern
#include "mc.h"
#define REGISTERS6 0
void code_init();
void free_register();
void emit_init();
void emit_push();
void gexpr();
void g_expr();
void bexpr();
void b_expr();
void string();
void function();
void machinop();
void rindirect();
void assign();
void assop();
void tosop();
char *div_setup() ;
void shift() ;
void lddim() ;
void ld_indexx();
void st_indexx();
void indexy();
void cmpdimm();
void global_table() ;
void local_table() ;
void opening();
void closing();
void gen_gdecl() ;
void jmp_label();
void jmp_eq_label();
void rexpr();
void jcond();
void jmp();
void def_label() ;
void gen_comment();
void gen_source();
void enter() ;
void enter1() ;
void ret();
void emit_data();
void text_mode();
void data_mode();
int cadr();
int car();
int caddr();
int fwdlabel();
void fwddef();
int cadddr();
int backdef();
int error();
int size();
int list3();
#define TEXT_EMIT_MODE 0
#define DATA_EMIT_MODE 1
static output_mode = TEXT_EMIT_MODE;
static data_alignment = 0;
/*
local1 <----24 local variable
%esi -20 <- disp_offset
%edi -16
%edx -12
%ecx -8
%ebx -4
%ebp = %esp 0
%eip 4 <- arg_offset
arg1 8
see enter/enter1/leave
*/
int arg_offset = 4;
int disp_offset = -20;
int int_size = 4;
int endian = 0;
int MAX_REGISTER=6; /* intel386のレジスタが6つということ*/
int MAX_DATA_REG=4;
int MAX_POINTER=3;
static int creg; /* current register */
static char *crn; /* current register name */
static int lreg; /* operand register */
static char *lrn; /* operand register name */
static int dreg; /* temporary register */
static char *drn; /* temporary register name */
static int xreg; /* pointer register */
static int reg_sp; /* REGister Stack-Pointer */
#define REG_EAX 0
#define REG_EBX 1
#define REG_ECX 2
#define REG_EDX 3
#define REG_ESI 4
#define REG_EDI 5
#define REG_EBP 6
#define REG_ESP 7
#define DATA_REG 0
#define POINTER_REG 3
static char *reg_name[8];
static char *reg_name_l[4];
/*
creg currrent virtual register
lreg operand virtual register
dreg spare virtual register
rname[creg] currrent real register
rname[lreg] operand real register
rname[dreg] spare real register
regs[] virtual register usage
reg_name[rname[creg]]
*/
#define MAX_MAX 10
static int rname[MAX_MAX];
static int regs[MAX_MAX]; /* 使われているレジスタを示すフラグ */
static int reg_stack[MAX_MAX]; /* 実際のレジスタの領域 */
void
code_init()
{
if (REGISTERS6) {
arg_offset = 4;
disp_offset = -20;
int_size = 4;
endian = 0;
MAX_REGISTER=6;
MAX_DATA_REG=4;
MAX_POINTER=3;
} else {
arg_offset = 4;
disp_offset = -12;
int_size = 4;
endian = 0;
MAX_REGISTER=4;
MAX_DATA_REG=4;
MAX_POINTER=1;
}
reg_name[REG_EAX] = "%eax";
reg_name[REG_EBX] = "%ebx";
reg_name[REG_ECX] = "%ecx";
reg_name[REG_EDX] = "%edx";
reg_name[REG_ESI] = "%esi";
reg_name[REG_EDI] = "%edi";
reg_name[REG_EBP] = "%ebp";
reg_name[REG_ESP] = "%esp";
reg_name_l[REG_EAX] = "%al";
reg_name_l[REG_EBX] = "%bl";
reg_name_l[REG_ECX] = "%cl";
reg_name_l[REG_EDX] = "%dl";
}
char *
regster(i)
int i;
{
return reg_name[rname[i]];
}
int
get_register()
{ /* 使われていないレジスタを調べる */
int i;
for(i=0;i<MAX_REGISTER;i++) {
if (! regs[i]) { /* 使われていないなら */
regs[i]=1; /* そのレジスタを使うことを宣言し */
return i; /* その場所を表す番号を返す */
}
}
return -1; /* 空いている場所がないなら、それを表す -1 を返す */
}
void
free_register(i) { /* いらなくなったレジスタを開放 */
regs[i]=0;
}
int
register_full()
{
int i;
for(i=0;i<MAX_REGISTER;i++) {
if (! regs[i]) {
return 0;
}
}
return 1;
}
void
emit_init()
{
int i;
for(i=0;i<MAX_REGISTER;i++) regs[i]=0;
for(i=0;i<MAX_REGISTER;i++) rname[i]=i;
creg = get_register();
crn = reg_name[rname[creg]];
drn = reg_name[rname[dreg]];
dreg = get_register();
reg_sp = 0;
text_mode();
}
void
set_crn(i)
int i;
{
creg = i;
crn = reg_name[rname[creg]];
}
void
set_drn(i)
int i;
{
dreg = i;
drn = reg_name[rname[dreg]];
}
int
virtual(real)
int real;
{
int real_v,i;
real_v = -1;
for(i=0;i<MAX_REGISTER;i++) {
if (rname[i]==real) {
real_v=i;
break;
}
}
if (real_v == -1)
error(-1);
return real_v;
}
void
use_register(virt,real,move)
int virt,real,move;
{
int real_v;
char *move_op;
if (rname[virt]==real)
return;
real_v = virtual(real);
move_op = regs[real_v]?"\txchg %s,%s\n":"\tmovl %s,%s\n";
if (move || regs[real_v]) {
printf(move_op,reg_name[rname[virt]],reg_name[real]);
}
rname[real_v] = rname[virt];
rname[virt] = real;
crn = reg_name[rname[creg]];
drn = reg_name[rname[dreg]];
lrn = reg_name[rname[lreg]];
}
void
use_pointer(virt,move)
int virt,move;
{
int i;
if (rname[virt]>=POINTER_REG)
return;
for(i=POINTER_REG;i<MAX_REGISTER;i++) {
if (!regs[virtual(i)]) {
use_register(virt,i,move);
return;
}
}
/* we prefer EBX */
use_register(virt,REG_EBX,move);
}
void
use_data_reg(virt,move)
int virt,move;
{
int i;
if (rname[virt]<MAX_DATA_REG)
return;
for(i=0;i<MAX_DATA_REG;i++) {
if (!regs[virtual(i)]) {
use_register(virt,i,move);
return;
}
}
/* we prefer EBX */
use_register(virt,REG_EBX,move);
}
int
pop_register()
{ /* レジスタから値を取り出す */
int i,j;
j = creg;
i = reg_stack[--reg_sp];
if(i<0) {
return i;
} else {
lreg = i;
lrn = reg_name[rname[lreg]];
regs[i]=0;
return lreg;
}
}
int
stack_used() {
return reg_stack[--reg_sp]<0;
}
void
emit_push()
{
int new_reg;
new_reg = get_register();
if(new_reg<0) { /* もうレジスタがない */
reg_stack[reg_sp++] = -1;
printf("\tpushl %s\n",crn);
} else {
reg_stack[reg_sp++] = creg; /* push するかわりにレジスタを使う */
set_crn(new_reg);
}
}
char *
emit_pop(type)
int type;
{
char *xrn;
if (pop_register()==-1) {
if (type==POINTER_REG)
use_pointer(dreg,0);
else if (type==DATA_REG)
use_data_reg(dreg,0);
printf("\tpopl %s\n",drn);
xrn = drn;
xreg = dreg;
} else {
xrn = lrn;
xreg = lreg;
}
return xrn;
}
void
gexpr(e1)
int e1;
{
emit_init();
g_expr(e1);
csvalue = rname[creg]; /* for siwtch value */
}
void
g_expr(e1)
int e1;
{
int e2,e3,e4;
char *xrn;
if (chk) return;
e2 = cadr(e1);
switch (car(e1)){
case GVAR:
/* use_pointer(creg,0); */
printf("\tmovl $%s,%s\n",caddr(e1),crn);
return;
case RGVAR:
/* use_pointer(creg,0); */
printf("\tmovl %s,%s\n",caddr(e1),crn);
return;
case CRGVAR:
printf("\tmovsbl %s,%s\n",caddr(e1),crn);
return;
case LVAR:
/* use_pointer(creg,0); */
printf("\tlea %d(%%ebp),%s\n",e2,crn);
return;
case RLVAR:
printf("\tmovl %d(%%ebp),%s\n",e2,crn);
return;
case CRLVAR:
printf("\tmovsbl %d(%%ebp),%s\n",e2,crn);
return;
case FNAME:
printf("\tmovl $%s,%s\n",((NMTBL *)e2)->nm,crn);
return;
case CONST: /* 代入する値が0でも特別な処理はしない */
printf("\tmovl $%d,%s\n",e2,crn);
return;
case STRING:
string(e1);
return;
case FUNCTION:
function(e1);
return;
case INDIRECT:
g_expr(e2);
return;
case RINDIRECT: case CRINDIRECT:
rindirect(e1);
return;
case ADDRESS:
g_expr(e2);
return;
case MINUS: /* レジスタに対し、neglを実行すれば実現可能 */
g_expr(e2);
/* use_data_reg(creg,1); */
printf("\tnegl %s\n", crn);
return;
case BNOT: /* ~ */
g_expr(e2);
/* use_data_reg(creg,1); */
printf("\tnotl %s\n", crn);
return;
case LNOT: /* ! */
g_expr(e2);
use_data_reg(creg,1);
printf("\tcmpl $0,%s\n", crn);
printf("\tsete %s\n", reg_name_l[rname[creg]]);
printf("\tmovzbl %s,%s\n", reg_name_l[rname[creg]],crn);
return;
case PREINC:
g_expr(e2);
printf("\taddl $%d,(%s)\n",caddr(e1),crn);
printf("\tmovl (%s),%s\n",crn,crn);
return;
case POSTINC:
g_expr(e2);
emit_push(); /* in case of register full we should copy crn to drn */
xrn = emit_pop(0);
printf("\tmovl (%s),%s\n",xrn,crn);
printf("\taddl $%d,(%s)\n",caddr(e1),xrn);
return;
case CPOSTINC:
/* char *p; *p++ */
g_expr(e2);
emit_push(); /* in case of register full we should copy crn to drn */
xrn = emit_pop(0);
printf("\tmovsbl (%s),%s\n",xrn,crn);
printf("\tincl (%s)\n",xrn);
return;
case CPREINC:
g_expr(e2);
printf("\tincl (%s)\n",crn);
printf("\tmovsbl (%s),%s\n",crn,crn);
return;
case CPOSTDEC:
g_expr(e2);
printf("\tmovsbl (%s),%s\n",crn,crn);
printf("\tdecl (%s)\n",crn);
return;
case CPREDEC:
emit_push();
g_expr(e2);
xrn = emit_pop(0);
printf("\tdecl (%s)\n",xrn);
printf("\tmovsbl (%s),%s\n",xrn,crn);
return;
case MUL: case UMUL:
case DIV: case UDIV:
case MOD: case UMOD:
case LSHIFT: case ULSHIFT: case RSHIFT: case URSHIFT:
case ADD: case SUB: case BAND: case EOR: case BOR:
machinop(e1);
return;
case COND:
e2=fwdlabel();
b_expr(cadr(e1),0,e2);
g_expr(caddr(e1));
e4 = rname[creg];
jmp(e3=fwdlabel());
fwddef(e2);
g_expr(cadddr(e1));
use_register(creg,e4,1);
fwddef(e3);
return;
case ASS: case CASS:
assign(e1);
return;
case ASSOP: case CASSOP:
assop(e1);
return;
case COMMA:
g_expr(e2);
g_expr(caddr(e1));
return;
default:
b_expr(e1,1,e2=fwdlabel()); /* including > < ... */
printf("\txorl %s,%s\n",crn,crn);
jmp(e3=fwdlabel());
fwddef(e2);
printf("\tmovl $1,%s\n",crn);
fwddef(e3);
}
}
void
bexpr(e1,cond,l1)
int e1,l1;
char cond;
{
emit_init();
b_expr(e1,cond,l1);
}
void
b_expr(e1,cond,l1)
int e1,l1;
char cond;
{
int e2,l2;
if (chk) return;
e2=cadr(e1);
switch(car(e1)) {
case LNOT:
b_expr(e2,!cond,l1);
return;
case GT:
rexpr(e1,l1,cond?"g":"le");
return;
case UGT:
rexpr(e1,l1,cond?"a":"be");
return;
case GE:
rexpr(e1,l1,cond?"ge":"l");
return;
case UGE:
rexpr(e1,l1,cond?"ae":"b");
return;
case LT:
rexpr(e1,l1,cond?"l":"ge");
return;
case ULT:
rexpr(e1,l1,cond?"b":"ae");
return;
case LE:
rexpr(e1,l1,cond?"le":"g");
return;
case ULE:
rexpr(e1,l1,cond?"be":"a");
return;
case EQ:
rexpr(e1,l1,cond?"e":"ne");
return;
case NEQ:
rexpr(e1,l1,cond?"ne":"e");
return;
case LAND:
b_expr(e2,0,cond?(l2=fwdlabel()):l1);
b_expr(caddr(e1),cond,l1);
if(cond) fwddef(l2);
return;
case LOR:
b_expr(e2,1,cond?l1:(l2=fwdlabel()));
b_expr(caddr(e1),cond,l1);
if(!cond) fwddef(l2);
return;
case CRGVAR:
printf("\tcmpb $0,%s\n",caddr(e1));
jcond(l1,cond);
return;
case CRLVAR:
printf("\tcmpb $0,%d(%%ebp)\n",e2);
jcond(l1,cond);
return;
case RGVAR:
printf("\tcmpl $0,%s\n",caddr(e1));
jcond(l1,cond);
return;
case RLVAR:
printf("\tcmpl $0,%d(%%ebp)\n",e2);
jcond(l1,cond);
return;
case CONST:
if((cond&&e2)||(!cond&&!e2)) jmp(l1);
return;
default:
g_expr(e1);
printf("\tcmpl $0,%s\n",crn);
jcond(l1,cond);
return;
}
}
void
ascii(s)
char *s;
{
printf("\t.ascii \"");
while(*s) {
if (*s=='\n')
printf("%cn",92);
else if (*s<' ')
printf("%c%03o",92,*s);
else if (*s==34)
printf("%c%c",92,34);
else
printf("%c",*s);
s++;
}
printf("%c%c%c\n",92,'0',34);
}
void
string(e1)
int e1;
{
char *s;
int i,lb;
if (0) {
s=(char *)cadr(e1);
lb=fwdlabel();
printf("\tjmp _%d\n",lb);
i=backdef();
ascii(s);
printf("\t.align 2\n");
fwddef(lb);
printf("\tlea _%d,%s\n",i,crn);
} else {
s=(char *)cadr(e1);
printf(".section\t.rodata\n");
lb=fwdlabel();
printf("_%d:\n",lb);
ascii(s);
if (output_mode==TEXT_EMIT_MODE) {
printf(".text\n");
} else {
text_mode();
}
printf("\tlea _%d,%s\n",lb,crn);
}
}
void
function(e1)
int e1;
{
int e2,e3,e4,e5,nargs;
NMTBL *n;
e2 = cadr(e1);
nargs = 0;
for (e3 = caddr(e1); e3; e3 = cadr(e3)) {
n=(NMTBL *)(e5=(cadr(e4 = car(e3))));
switch(car(e4)) {
case FNAME:
printf("\tlea $%s,%s\n",n->nm,crn);
printf("\tpushl %s\n",crn);
break;
case ADDRESS:
g_expr(e5);
printf("\tpushl %s\n",crn);
break;
default:g_expr(e4);
printf("\tpushl %s\n",crn);
}
++nargs;
}
if (car(e2) == FNAME) {
n=(NMTBL *)cadr(e2);
use_register(creg,REG_EAX,0);
printf("\tcall\t%s\n",n->nm);
} else {
g_expr(e2);
use_register(creg,REG_EAX,0);
printf("\tcall\t*%s\n",crn);
}
/*
if (regs[2]&&creg!=2) printf("# unsaved register %s %d\n",reg_name[2],lineno);
if (regs[3]&&creg!=3) printf("# unsaved register %s %d\n",reg_name[3],lineno);
if (regs[4]&&creg!=4) printf("# unsaved register %s %d\n",reg_name[4],lineno);
if (regs[5]&&creg!=5) printf("# unsaved register %s %d\n",reg_name[5],lineno);
*/
if (nargs) printf("\taddl $%d,%%esp\n",4*nargs);
}
void
machinop(e1)
int e1;
{
int e2,e3,op;
e2 = cadr(e1);
op = car(e1);
e3 = caddr(e1);
g_expr(e3);
emit_push();
g_expr(e2);
tosop(car(e1));
return;
}
void
rindirect(e1) /* *(p +5 ) */
int e1;
{
char *op;
int e2,e3,byte;
op = ((byte = (car(e1) == CRINDIRECT)) ? "movsbl" : "movl");
e3 = cadr(e2 = cadr(e1));
g_expr(e2);
printf("\t%s (%s),%s\n",op,crn,crn);
}
void
assign(e1)
int e1;
{
char *op;
int e2,e3,e4,byte;
char *xrn;
op = ((byte=(car(e1) == CASS))? "movb" : "movl");
/* e2=e4 */
e2 = cadr(e1);
e3 = cadr(e2);
e4 = caddr(e1);
switch(car(e2)) {
case GVAR: /* i=3 */
g_expr(e4);
if (byte) use_data_reg(creg,1);
printf("\t%s %s,%s\n",op,crn,caddr(e2));
return;
case LVAR:
g_expr(e4);
if (byte) use_data_reg(creg,1);
printf("\t%s %s,%d(%%ebp)\n",op,crn,cadr(e2));
return;
}
g_expr(e4);
emit_push();
g_expr(e2);
xrn = emit_pop(0);
if (byte) use_data_reg(creg,1);
printf("\t%s %s,(%s)\n",op,xrn,crn);
printf("\tmovl %s,%s\n",xrn,crn);
return;
}
void
assop(e1)
int e1;
{
int e2,e3,byte,op;
char *xrn;
/* e2 op= e3 */
byte = (car(e1) == CASSOP);
e2 = cadr(e1);
if (car(e2)==INDIRECT) e2=cadr(e2);
e3 = caddr(e1);
op = cadddr(e1);
g_expr(e3);
emit_push();
g_expr(e2);
emit_push();
xrn = emit_pop();
ld_indexx(byte,0,xrn);
tosop(op);
emit_push();
g_expr(e2);
xrn = emit_pop();
printf("\t%s %s,(%s)\n",byte ? "movb" : "movl",xrn,crn);
printf("\tmovl %s,%s\n",xrn,crn);
return;
}
void
tosop(op)
int op;
{
int oreg;
char *orn;
oreg = pop_register();
switch(op) {
case LSHIFT:
case ULSHIFT:
shift("sall",oreg);
return;
case RSHIFT:
shift("sarl",oreg);
return;
case URSHIFT:
shift("shrl",oreg);
return;
}
if(oreg==-1) {
printf("\tpopl %s\n",drn);
oreg = dreg;
}
orn = reg_name[rname[oreg]];
switch(op) {
case ADD:
printf("\taddl %s,%s\n",orn,crn);
return;
case SUB:
printf("\tsubl %s,%s\n",orn,crn);
return;
case BAND:
printf("\tandl %s,%s\n",orn,crn);
return;
case EOR:
printf("\txorl %s,%s\n",orn,crn);
return;
case BOR:
printf("\torl %s,%s\n",orn,crn);
return;
case MUL:
case UMUL:
/* use_register(dreg,REG_EDX,0); */
printf("\t%s %s,%s\n","imull",orn,crn);
return;
case DIV:
case UDIV:
orn = div_setup(oreg);
if (op==DIV)
printf("\tcltd\n\tdivl %s\n",orn);
else
printf("\txor %%edx,%%edx\n\tidivl %s\n",orn);
div_cleanup(orn);
return;
case MOD:
case UMOD:
orn = div_setup(oreg);
if (op==DIV)
printf("\tcltd\n\tdivl %s\n",orn);
else
printf("\txor %%edx,%%edx\n\tidivl %s\n",orn);
rname[creg]=REG_EDX;
crn=reg_name[REG_EDX];
rname[dreg]=REG_EAX;
drn=reg_name[REG_EAX];
div_cleanup(orn);
return;
}
}
static char *dvi_push = "(%esp)";
char *
div_setup(oreg)
int oreg;
{
if (oreg<0) {
use_register(creg,REG_EAX,1);
use_register(dreg,REG_EDX,0);
return 0;
}
if (register_full()) {
printf("\tpushl %s\n",reg_name[rname[oreg]]);
use_register(creg,REG_EAX,1);
use_register(oreg,REG_EDX,0);
return dvi_push;
}
regs[oreg]=1;
use_register(creg,REG_EAX,1);
use_register(dreg,REG_EDX,0);
regs[oreg]=0;
return reg_name[rname[oreg]];
}
div_cleanup(orn)
char *orn;
{
if (orn==dvi_push)
printf("\taddl $4,%%esp\n");
}
void
shift(op,reg)
char *op;
int reg;
{
if (reg>=0) {
use_register(lreg,REG_ECX,1);
} else {
use_register(dreg,REG_ECX,0);
printf("\tpopl %%ecx\n");
}
printf("\t%s %%cl,%s\n",op,crn);
}
void
lddim(n) /* modified */
int n;
{
printf("\tmovl $%d,%s\n",n,crn);
}
void
ld_indexx(byte,n,xrn)
int byte,n;
char *xrn;
{
char *op;
op = byte ? "movsbl" : "movl";
if (n)
printf("\t%s %d(%s),%s\n",op,n,xrn,crn);
else
printf("\t%s (%s),%s\n",op,xrn,crn);
}
void
st_indexx(byte,n,xrn)
int byte,n;
char *xrn;
{
char *op;
op = byte ? "movb" : "movl";
if (n)
printf("\t%s %s,%d(%s)\n",op,crn,n,xrn);
else
printf("\t%s %s,(%s)\n",op,crn,xrn);
}
void
indexy(op,gvar)
char *op;
char *gvar;
{
printf("\t%s %s,%s\n",op,crn,gvar);
}
void
cmpdimm(e,csreg)
int e,csreg;
{
/* used in dosiwtch() */
use_register(creg,csreg,0);
printf("\tcmpl $%d,%s\n",e,crn);
}
void
opening(filename)
char *filename;
{
printf("\t.file \"%s\"\n",filename);
printf("\t.version\t\"01.01\"\n");
printf("gcc2_compiled.:\n");
printf(".text\n");
emit_init();
}
void
closing()
{
global_table();
printf("\t.ident \"Micro-C compiled\"\n");
}
void
jmp_label(l)
int l;
{
printf("\tjmp\t_%d\n",l);
}
void
jmp_eq_label(l)
int l;
{
printf("\tje\t_%d\n",l);
}
void
rexpr(e1,l1,s)
int e1,l1;
char *s;
{
g_expr(list3(SUB,cadr(e1),caddr(e1)));
printf("\tj%s\t_%d\n",s,l1);
}
void
jcond(l,cond)
int l;
char cond;
{
printf("\tj%s\t_%d\n",cond?"ne":"e",l);
}
void
jmp(l)
int l;
{
control=0;
printf("\tjmp\t_%d\n",l);
/* align? */
}
int
fwdlabel()
{
return labelno++;
}
void
fwddef(l)
int l;
{
control=1;
printf("_%d:\n",l);
}
int
backdef()
{
control=1;
printf("_%d:\n",labelno);
return labelno++;
}
void
def_label(cslabel,dlabel)
int cslabel,dlabel;
{
int fl;
fl = 0;
if (control) {
jmp(fl=fwdlabel());
}
fwddef(cslabel);
if (dlabel)
jmp(dlabel);
if (fl) {
fwddef(fl);
}
}
void
gen_comment(s)
char *s;
{
printf("# %s",s);
}
void
gen_source(s)
char *s;
{
printf("%s",s);
}
void
enter(name)
char *name;
{
text_mode();
printf("\t.align 2\n");
if (stmode!=STATIC)
printf(".globl %s\n",name);
printf("%s:\n",name);
printf("\t.type\t%s,@function\n",name);
printf("\tpushl %%ebp\n");
printf("\tmovl %%esp,%%ebp\n");
printf("\tpushl %%ebx\n");
printf("\tpushl %%ecx\n");
printf("\tpushl %%edx\n");
if (REGISTERS6) {
printf("\tpushl %%edi\n");
printf("\tpushl %%esi\n");
}
}
void
enter1(disp)
int disp;
{
if(disp) printf("\tsubl $%d,%%esp\n",-disp);
}
void
leave(control,name)
int control;
char *name;
{
fwddef(retlabel);
use_register(creg,REG_EAX,1);
if (REGISTERS6) {
printf("\tpopl %%esi\n");
printf("\tpopl %%edi\n");
}
if(disp) printf("\taddl $%d,%%esp\n",-disp);
printf("\tpopl %%edx\n");
printf("\tpopl %%ecx\n");
printf("\tpopl %%ebx\n");
printf("\tleave\n");
printf("\tret\n");
local_table();
printf("_%d:\n",labelno);
printf("\t.size\t%s,_%d-%s\n",name,labelno,name);
labelno++;
}
void
ret()
{
use_register(creg,REG_EAX,1);
jmp(retlabel);
}
void
gen_gdecl(n,gpc)
char *n;
int gpc;
{
/*
if (stmode!=STATIC)
printf(".globl %s\n",n);
*/
}
void
align()
{
if (data_alignment & 1)
printf("\t.align 2\n");
data_alignment = 0;
}
void
emit_data(e,t,n)
int e,t;
NMTBL *n;
{
int l;
char *name;
name = n->nm;
if(mode==GDECL) { /* global */
n->dsp = -1; /* initiallized flag */
printf(".globl\t%s\n",name);
if(car(e)==CONST) {
data_mode(name);
if (t==CHAR) {
printf("%s:\n",name);
printf("\t.byte %d\n",cadr(e));
if (data_alignment>0)
data_alignment++;
} else {
align();
printf("%s:\n",name);
printf("\t.long %d\n",cadr(e));
}
} else if(t!=CHAR) {
if(car(e)==ADDRESS&&car(cadr(e))==GVAR) {
data_mode(name);
align();
printf("%s:\n",name);
printf("\t.long %s\n",caddr(cadr(e)));
} else if(car(e)==FNAME) {
data_mode(name);
align();
printf("%s:\n",name);
printf("\t.long %s\n",((NMTBL *)cadr(e))->nm);
} else if(car(e)==STRING) {
text_mode();
l = backdef();
ascii((char *)cadr(e));
data_mode(name);
align();
printf("%s:\n",name);
printf("\t.long _%d\n",l);
} else error(TYERR);
}
} else {
if(car(e)==CONST) {
lddim(cadr(e));
indexy(t==CHAR?"movsbl":"movl",name);
} else if(t!=CHAR) {
if(car(e)==ADDRESS&&car(cadr(e))==GVAR)
printf("\tlea %s,%s\n",caddr(e),crn);
else if(car(e)==FNAME)
printf("\tlea %s,%s\n",((NMTBL *)cadr(e))->nm,crn);
else if(car(e)==STRING) {
string(e);
} else error(TYERR);
printf("\tmovl %s,%s\n",crn,name);
}
}
}
void
global_table()
{
NMTBL *n;
for(n=ntable;n < &ntable[GSYMS];n++) {
if (n->sc == GVAR && n->dsp != -1) {
/* n->dsp = -1 means initialized global */
printf(".comm %s,%d\n",n->nm,size(n->ty));
}
}
}
void
local_table()
{
NMTBL *n;
/* static local variables */
for(n=ntable+GSYMS;n < &ntable[GSYMS+LSYMS];n++) {
if (n->sc == GVAR) {
printf(".lcomm %s,%d\n",n->nm,size(n->ty));
}
}
}
void
text_mode()
{
if (output_mode!=TEXT_EMIT_MODE) {
printf(".text\n");
printf("\t.align 2\n");
output_mode = TEXT_EMIT_MODE;
}
}
void
data_mode(name)
char *name;
{
if (output_mode!=DATA_EMIT_MODE) {
printf(".data\n");
output_mode = DATA_EMIT_MODE;
}
printf("\t.type\t%s,@object\n",name);
}
/* end */